<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
    *{margin: 0;padding: 0}
    .search{
        margin: 100px;
        width: 240px;
        height: 40px;
        position: relative;
    }
    button{
        position: absolute;
        width: 23px;
        height: 22px;
        right: 5px;
        top: 50% ;
        margin-top:-11px;
        background: url("images/icon4.png") ;border: none;
    }
    input{
        padding-left: 20px;border: none;
        border-radius: 30px;outline: none;
        width: 220px;height: 40px;background: #eee;
    }
    </style>
</head>
<body>
    <div class="search">
        <input type="text" placeholder="搜索">
        <button></button>
    </div>
</body>
</html>